Improvement in gun-wipers



H. GREVE.

Gun Wiper. No. 101,997. Patented April 19, 1870.

N.FEIERS, PHOTD-IJTHQGRAFMER, WASHINGTON, D c.

new fitters pane ctiijiire.

Letters Patent No. 101,997, dated April 19, 1870.

IMPROVEMENT IN GUN-WIPETIS.

The Schedule referred to in these Letters Patent $161 making part of thename To all whom it may concern Be it known that I, HERMAN Gnnvn, ofSparta, in the county'of Monroe and State of \Visconsin, have invented anew and improved Gun-Wiper; and I do hereby declare that the followingis a full, clear, and exact description thereof, which will enableothers skilled in the art to make and use the same, reference being hadto the accompanying drawing forming part of this specification.

This invention relates to a new 'gnn-wiperfor smallarms, and consists inan expanding and contracting cylindrical piece of vulcanized Indiarubber or other suitable substance, made hollow for the most part of itslength, having a screw-plug arranged in the hollow and permanentlyconnected at the bottom, and provided with spiral grooves on theexterior, which is dropped into the barrel, and expanded by a rod with atubular end, having screw-threads fitted for the screw-plug, and screweddown therein, to expand the wiper against the wall of the barrel, and toturnit to scrape the foul matter adhering to the inner wall of thebarrel, into the grooves of the wiper, so that it may be drawn out whenthe wiper is withdrawn.

Figure I is a side elevation of my improved gunwiper, and

Figure 2 is a sectional elevation of the same.

Similar-letters of reference indicate corresponding p A is thevulcanized India-rubber wiper, or it may be made of other material whichwill expand and contract.

It is provided with a deep, wide spiral groove, 1), on the surface ofthe cylindrical part, and small ribs 0 at the lower rounded end, and ascrew-threaded rod, (8, is fitted in the bore, and secured at the bottomby pins or otherwise. This rod projects a short distance above the topof the wiper, for the reception of the tubular end of the ramrod, whichis threaded internally to screw down .upon the rod, to the bottom of thebore of the wiper, for expanding it against the walls of the barrel ofthe gun, to cause it to press with sufficient force to scrape oii thefoul matter adhering thereto, and gather it in the groove 1), to bedrawn out when the wiper is withdrawn.

To prevent the wiper from turning when the end f is screwed down intothe bore for expanding it, a sufficient end pressure is imparted to itthrough the rod to press the ribbed end into the chamber at the bottomof a smooth-bore, or to expand it into the grooves of a rifle-bore, soas to encounter resistance greater than the friction of screwing the rodin.

It will be seen that the wiper is expanded after being shoved into thebarrel, and thus acts more eifectnally on the wall of the bore, removingthe foul matter which is forced down in advance of the wiper.

The ribs 0 at the end are also intended to have sufficient spiral pitchto raise the substance that maybe in the bottom of the chamber.

Having thus described my invention,

I claim as new and desire to secure by Letters Patent Thespirallygrooved contracting and expanding wiper A, made of vulcanizedIndia rubber or other suitable substance, and provided with thescrewthreaded rod d, secured at the bottom of the central bore, and alladapted for the application of the internally screw-threaded tubularextension of the ramrod, all substantially as specified.

The above specification of my invention signed by me this 7th day ofMarch, 1870.

' HERMAN GREVE. Witnesses:

Geo. W. Manna, ALEX. I ROBERTS.

